He is now the American who has flown the longest space mission in U.S. History.
On Monday at around 1:30 p.m., Rubio surpassed the 355 days, 3 hours, and 45 minutes logged by NASA astronaut Mark Vande Hei last year.
Since Rubio is not scheduled to arrive back on Earth until September 27, he will have spent 371 days in space.
He will soon become the first American and one of only six people to spend a year in space.